.zz-df {
    display:flex;
}

/*  */
.zz-df-jc-c {justify-content: center;}
.zz-df-jc-sb {justify-content:space-between;}
.zz-df-jc-sa {justify-content:space-around;}
/*  */
.zz-df-ai-c {align-items: center;}
/*  */